I have been putting myself through this same mental assessment. Seems soon as I feel like I've crossed the hump and feel like a honest to goodness quilter something goes array and my self assessment hits the bricks.
I face the reality that I will never be a artistic type quilter, my patterns will always be simple, I have little interest in applique, little patience for hand quilting. I do push myself on each project to work on, improve some aspect of my abilities and I do have quilting goals. I grade myself as a low average. When I gift quilts I throw in the disclaimer "I do NOT make heirlooms, my quilts are made for loving and using".
I also find I may go months between quilts which probably slows my quilting progress.